Strong Password Generator
Quantum SafeGenerate strong passwords and passphrases in your browser. Nothing leaves your device.
Strong Password Generator
Generate strong passwords instantly — free, secure, and entirely in your browser. Every password is created using cryptographic randomness (Web Crypto API) and nothing is ever sent to a server. Choose your preferred length, character types, or switch to memorable passphrases. Strong passwords are your first line of defense against unauthorized access to your accounts.
Why random passwords matter
Reusing passwords or choosing predictable ones is the leading cause of account breaches. Attackers use credential-stuffing tools that test billions of leaked username-password pairs across popular services. A single reused password can compromise your email, banking, and social media accounts in minutes. A truly random password — one generated by a cryptographic algorithm rather than a human brain — eliminates the patterns that attackers exploit. Each password from this generator is statistically independent, so knowing one reveals nothing about the next.
How this generator works
The generator uses the Web Crypto API (window.crypto.getRandomValues), the same cryptographic random number generator that your browser relies on for TLS connections. When you click "Regenerate", the tool builds a character pool from your selected options (uppercase, lowercase, digits, symbols), draws random indices, and assembles the password entirely in memory. No network request is made — your password never leaves the page. The source code is open and auditable on GitHub.
How long should a password be?
Password length is the single biggest factor in security. Each additional character multiplies the number of possible combinations exponentially. An 8-character password using all character types has about 47 bits of entropy and can be brute-forced in hours. A 12-character password jumps to about 71 bits — enough for most accounts. A 16-character password provides roughly 95 bits, making brute-force attacks computationally infeasible with current hardware. For high-value accounts like email, banking, and password manager vaults, we recommend 16 characters or more.
Password vs passphrase: which should you use?
Random passwords are ideal when you paste them from a password manager — maximum entropy per character, no need to memorize. Passphrases are better when you need to type the password by hand: logging into your computer, entering a WiFi key on a smart TV, or unlocking your password manager vault. A 5-word passphrase like "Timber-Canoe-Frozen-Maple-97" provides over 60 bits of entropy while remaining human-readable. The best approach is to use both: passphrases for the few passwords you type daily, and random passwords (stored in a manager) for everything else.
Quantum-safe password generation and sharing
This generator uses AES-256-GCM encryption and HKDF-SHA-256 key derivation — pure symmetric cryptography with no RSA, ECC, or Diffie-Hellman involved. Quantum computers threaten asymmetric algorithms (Shor's algorithm breaks RSA and ECC), but symmetric algorithms like AES-256 remain secure: even Grover's algorithm only reduces AES-256 to 128-bit equivalent security, which is still far beyond any known attack. When you share a generated password as a one-time link, the encryption key stays in the URL fragment and never touches the server. No asymmetric key exchange means no quantum vulnerability. NIST recommends AES-256 for post-quantum use (SP 800-131A).
Frequently asked questions
- Is this password generator safe to use?
- Yes. Passwords are generated entirely in your browser using the Web Crypto API. Nothing is transmitted to any server. You can verify this by disconnecting from the internet — the generator still works. The code is open source and auditable.
- How do I remember a random password?
- You don't need to. Use a password manager like Bitwarden, 1Password, or KeePass to store your passwords. The only password you need to memorize is your master password — for that, use the passphrase mode to create something memorable.
- What makes a password strong?
- Three factors: length (12+ characters minimum), randomness (generated by an algorithm, not chosen by a human), and uniqueness (never reused across accounts). A 16-character random password with mixed character types is virtually uncrackable.
- Should I include symbols in my password?
- When possible, yes. Symbols increase the character pool from 62 to 94 characters, adding roughly 6 bits of entropy at 16 characters. However, some older systems don't accept certain symbols. If a site rejects your password, try regenerating without symbols or use a longer alphanumeric password instead.
- Is this password generator quantum-safe?
- Yes. The generator uses the Web Crypto API for randomness and AES-256-GCM for sharing — both are pure symmetric algorithms unaffected by quantum attacks. Unlike tools that rely on RSA or ECC for key exchange, 1time.io uses no asymmetric cryptography. NIST recommends AES-256 for continued use in the post-quantum era.